Cold Water Systems Quiz L3P2 U5,2.2

What is the most common cold water system used in the UK?

• Direct Cold Water System with instantaneous hot water supply

• Indirect Cold Water System

• Systems supplied from a Borehole

• Direct Cold Water System with stored water in the roof space

What is an advantage of the Direct Cold Water System?

• Smaller pipe sizes can be used in the majority of installations

• Little or no structural support is required for cisterns in the roof space

• It requires less pipework than any other installation

• Mains cold water is available at all cold water taps and outlets

What is a disadvantage of the Direct Cold Water System?

• There is no cold water storage if the cold water main is under repair

• At times of peak demand, the water pressure may drop

• Can be noisy due to the high flow rates and pressures of the water supply

• Greater risk of contamination to the cold water main

What is an advantage of the Indirect Cold Water System?

• Reduced risk of contamination

• Less risk of water hammer and reverberation noise

• Low pressure supply reduces the impact of leakage damage

• Pipework can be sized to give very good flowrates despite the lack of pressure

What is a disadvantage of the Indirect Cold Water System?

• Greater risk of frost damage of pipework and cisterns in the roof space

• A large amount of water storage is needed

• Cisterns use a lot of storage space in the roof

• The rising main must be protected against backflow from the cistern

Which of the borehole systems requires less pipework?

• Pumped supply with pressure control

• Pumped supply with level control

• Neither requires any pipework

• Both require the same amount of pipework

What is an advantage of the pumped supply with pressure control borehole system?

• Water is available in the event of pump failure

• It requires less pipework than any other installation

• Using an accumulator and a storage cistern means the pump is not running all the time

• Good pressure and flowrate to the kitchen sink outlet

What is a disadvantage of the pumped supply with pressure control borehole system?

• A large amount of water storage is needed

• Requires a large cistern in the roof space to supply all other outlets

• Greater risk of frost damage of pipework and cisterns in the roof space

• Cisterns use a lot of storage space in the roof

What is an advantage of the pumped supply with level control borehole system?

• Water is available in the event of pump failure

• An expensive accumulator is not required

• Using a storage cistern means the pump is only required to fill the cistern

• Little or no risk of water source contamination as all the dwellings water is supplied from a protected cistern

What is a disadvantage of the pumped supply with level control borehole system?

• Reduced pressure at some outlets and fittings

• More structural support required to carry the weight of the cisterns when full of water

• A large amount of water storage is needed

• Greater risk of frost damage of pipework and cisterns in the roof space